(19)

(11)

EP 1 264 503 A1

(12)

(43) Date of publication: 11.12.2002 Bulletin 2002/50 (21) Application number: 01911978.3 (22) Date of filing: 16.03.2001

(51) International Patent Classification (IPC)7: H04Q 7/38, H04L 29/08, H04L 12/56 (86) International application number: PCT/GB0101/203 (87) International publication number: WO 0106/9961 (20.09.2001 Gazette 2001/38)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR (30) Priority: 16.03.2000 GB 0006230 (71) Applicant: UNIVERSITY OF STRATHCLYDE Glasgow G1 1XQ (GB)	(72) Inventors: DUNLOP, John Glasgow G66 1EQ (GB) GIRMA, Demessie Glasgow G64 1XS (GB) IRVINE, James, Menzies Troon KA10 6HX (GB) ATKINSON, Robert, Caddell Clydebank G81 1ND (GB) LE BODIC, Gwenael F-92800 Puteaux (FR) (74) Representative: MacDougall, Donald Carmichael et al Cruikshank & Fairweather19 Royal Exchange Square Glasgow G1 3AE, Scotland Glasgow G1 3AE, Scotland (GB)